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Compression check question

  • Thread starter Thread starter BlooDReigN
  • Start date Start date Aug 15, 2004

BlooDReigN

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Feb 22, 2004
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Calgary, Alberta
Aug 15, 2004
#1
  • Aug 15, 2004
  • #1
I am about to do a compression check here, but I misplaced my Haynes manual. What are the factory compression numbers for the 302 HO?

Thanks in advance
 

jrichker

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Aug 16, 2004
#2
  • Aug 16, 2004
  • #2
With the engine warmed up, remove all spark plugs and prop the throttle wide open, crank the engine until it the gage reading stops increasing.

On a cold engine, it will be hard to tell what's good & what's not.

Some of the recent posts have numbers ranging from 140-185 psi. If the compression is low, squirt some oil in the cylinder and do it again – if it comes up, the rings are worn.

There should be no more than 10% difference between cylinders. Use a blow down leak test (puts compressed air inside cylinders) on cylinders that have more than 10% difference.
 
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